Note 5 - Derivative Instruments (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | |||
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 9,101 | $ 12,757 | $ 1,151 |
| Restricted Cash and Cash Equivalents | $ 225 | $ 1,464 | |